The setting for mail limiting in WHM is for each domain, but serverwide. You would need to make modifications to the cPanel script /etc/exim.pl to make it per domain or per email address and I'm not aware of anyone who has.

The setting for mail limiting in WHM is for each domain, but serverwide. You would need to make modifications to the cPanel script /etc/exim.pl to make it per domain or per email address and I'm not aware of anyone who has.